Pump mechanism



Dec. 19, 1944.

w. H. WINEMAN 2,365,234

PUMP MECHANISM Original Filed Spt. 17, 1940 Hg. 1. g 4 3 I x v ""lini WW II m 3/ 23 24 g? '||I|., 33 31 u /9 26 32 34 I I I 29 24 39 Invenior:ZdadeHZdhwmafl. Z 20 y Patented Dec. 19, 1944 PUMP MECHANISM Wade H.Wineman, Michigan City, Ind., assignor to Sullivan Machinery Company, acorporation of Massachusetts Jriginal application September 17, 1940,Serial No. 357,155. Divided and this application December 23, 1942,Serial No. 469,865

2 Claims. (01. 103-9) This invention relates to pump mechanisms, andmore particularly to pump mechanisms adapted to supply simultaneouslyfluids of different types under pressure to a common system.

It is sometimes necessary to supply both gaseous and liquid fluids to acommon system. A yieldable supporting structure in which a recessedpiston is urged in one direction in a cylinder by gaseous fluid underpressure and is sealed at its pressure end by a liquid, is one exampleof a system to which both liquid and gaseous fluids must be supplied. Insuch a system, the pressures on the liquid may cause the latter to workits way between the walls of the cylinder and piston and escape. If theseal is broken by the escape of the liquid or by a movement of thepiston end out of the liquid, then the gaseous fluid may escape. Torestore the pressure conditions Within the cylinder and to efiect asealing of the piston end, it is necessary that both liquid and gaseousfluids be pumped into the cylinder. A pump mechanism similar to that ofmy invention may be used to pump the fluids back into the system.

This pump mechanism may desirably comprise a cylinder block havingstepped bores which receive stepped portions of a piston. Opening intothe stepped bores are separate intake passages controlled by inletvalves. One of these passages is adapted to supply a liquid to itsconnected bore, and the other is adapted to supply a gaseous fluid. Thebores are connected in communication with each other by a passage whichis controlled by a one-way valve, and the bore to which fluid flows fromthe other bore, is connected to a valve controlled discharge passage. Bysupplying liquid, as contemplated in my invention, to the bore fromwhich fluid is pumped to the other bore, it will be seen that alubrication of each of the pistons will be obtained, the piston andcylinder portions of the gaseous fluid pump will be cooled by theliquid, and the liquid serves in the second bore to eliminate all of thepiston and valve clearance, thus assuring practically complete deliveryof gaseous fluid to the system. It will be understood, of course, thatthe parts of the pump mechanism may be arranged in different ways andstill effect the same result.

An object of this invention is to provide an improved pump mechanism.Another object is to provid ar improved pump mechanism adapted todeliver difierent fluids simultaneously to a common system. Stillanother object is to provide an improved liquid and gaseous fluid pumpin which the liquid is pumped through the gaseous fluid pump portion toa discharge line. Yet another object is to provide an improved pumpmechanism having a plurality of bores, and pistons making intake anddischarge strokes simultaneously in said bores for pumping a liquid anda gaseous fluid to a common discharge line, the liquid being pumpedthrough the gaseous fluid pump portion so as to eliminate clearances inthe latter, and to cool and lubricate its parts. Other objects of theinvention will appear in the course of the following description. Thisapplication is a division of my copending application Serial No.357,155, filed September 1'7, 1940.

Ther is shown in the drawing one form which the invention may assume inpractice.

In this drawing:

Fig. 1 is a vertical sectional view of a supporting structure with whichthe improved pump mechanism is adapted for use, the pump mechanism beingshown in side elevation.

Fig. 2 is anenlarged vertical sectional view of the pump mechanism shownin Fig. 1.

In the illustrative embodiment of the invention there is shown a "beamtype pumping apparatus, generally designated I, including a yieldablesupporting structure 2, a walking beam 3, and the improved pumpmechanism 4.

The supporting structure 2 includes a cylinder 6 supported in a verticalposition by legs 8 and receiving in its bore 9 a sleevelike piston Illclosed at its upper end. Th walking beam 3 is pivotally attached, at H,to the upper end of the piston, and is adapted to be driven by anysuitable means not shown. The cylinder bore 9 is closed at its lower endby a wall 12 and is partially filled with a liquid for sealing air underpressure within the upper portion of the sleevelike piston. Any liquidor air escaping between the walls of the piston and the cylinder entersan annular groove I 4 formed in the walls of the cylinder bore at itsupper end and is conducted through a. conduit It: to a tank I6. Airescaping to the tank It is vented from the latter through a vent portl8. The improved pump mechanism 4 operates to pump liquid from the tankthrough a flexible conduit l9, and to pump air taken from the atmospherethrough a filter 20, back into the cylinder bore through a conduit 2|extending to the bottom of the piston. It will be understood that theyielding supporting structure is merely illustrative of 'a device withwhich the improved pump mechanism is adapted for use.

Referring to the improved pump mechanism 4, it will be noted that acylinder block 23 is attached, as by bolts 2!, to a portion formed onand extending transversely from the upper end of the piston l0. Formedin the cylinder block are stepped bores 25 and 26 opening into eachother. and the larger bore 25 opens through the top of the cylinderblock. A piston 21 having portions 28 and 23 receivable, respectively inthe bores 25 and 26 is connected by a link 30 to the walking beam 3 tobe driven thereby. The displacement of the piston portion 26 in thelarger bore is smaller than the displacement of the piston portion 29 inthe smaller bore. The conduit 13 opens into a passage 32 controlled by aball valve 33 and opening into the lower end of the bore 25. A passage34 in the cylinder block connects the lower ends of the cylinder bores25 and 26 and is controlled by a spring seated ball valve 36. A passage31 opening into the lower end of the cylinder bore 26 is connected tothe air filter 20 under the control of a ball valve 38 and to theconduit 2| under the control of a ball valve 39.

As the walking beam is rocked on its pivot II, the link 30 causes thepiston 21 to be reciprocated. A reciprocation of the piston portion 28within the bore 25 causes liquid to be pumped from the tank [6 throughthe conduit 59 and through the passage 34 to the bore 26. If all theliquid is pumped from the tank, then air entering the tank through thevent port 1 8 will be pumped by the piston portion 26 to the bore 26.During the suction strokes of the piston 21, air will be taken throughthe filter 26 past the valve 38 into the bore 26. No liquid will betaken into the bore 26 during the suction stroke of the piston since thevalve 36 will be held seated by its spring as well as by the suctionproduced by the piston portion 28. During the compression stroke of thepiston, the air in bore 26 as well as the liquid or air delivered to thebore 26 from the bore 25, will be pumped to the conduit 2|. If thepressure within the sleeve-like piston l increases to a point where itraises the lower end of the piston above the level of the liquid, thenthe air is permitted to escape through a conduit 40 to the groove I4where it enters the conduit l and is conducted to the tank l6 to bevented through the port l8. Any liquid carried from the cylinder withthe air will drop into the tank I 6 and be pumped back into the cylinder6.

As a result of this invention there is provided an improved pump adaptedto deliver a liquid and a gaseous fluid simultaneously to a commonsystem. It will be noted that the pump is extremely compact. By reasonof the discharge of the liquid through the gaseous fluid pump portion, acomplete discharge of the gaseous fluid from the pump is assured, andhigh pressures in the system may be maintained with only one stage ofcompression. It will further be noted that eiTective cooling andlubrication of the pump are obtained. Other advantages will be apparentto those skilled in the art.

While there is shown in this application one form which the inventionmay assume in practice, it will be understood that this form of the sameis shown for purposes or illustration and that the invention may bemodified and embodied in various other forms without departing from itsspirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a combined liquid and gaseous fluid pump, in combination, acylinder block having stepped bores therein, a piston having portionsfitting each of said bores, a valve controlled supply passage openinginto the larger of said stepped bores adjacent the junction of saidbores, a valve controlled supply passage opening into the smaller ofsaid stepped bores at its end opposite the junction of said bores, thefirst of said supply passages adapted to communicate with a liquidsupply chamber and the second one of said supply passages adapted tocommunicate with a source of gaseous fluid, a, valve controlled passagefor connecting said bores in communication with each other and havingassociated therewith means permitting flow only from the larger to thesmaller bore, and a valve controlled terminal discharge passage for saidpump opening only into the smaller of said bores.

2. In a pump, in combination, a cylinder block having stepped borestherein, a piston having.

portions fitting each of said bores, the displacement of the piston inthe larger bore'being smaller than the displacement of the piston in thesmaller bore, valve controlled supply passages opening into said bores,a valve controlled passage connecting said bores and permitting thedischarge of fluid from the larger bore to the smaller bore whileprecluding reverse flow, and a valve controlled terminal dischargepassage for said pump connected only with said smaller bore.

WADE H. WINEMAN.

